using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using UAF.WPF.Commands;

namespace DataFileAnalyzer.Commands
{
    public class OpenFileCommand : BaseCommand
    {
        public override bool CanExecute(object parameter)
        {
            DataFileAnalyzerModel model = parameter as DataFileAnalyzerModel;
            if (model != null && model.SelectedFile != null)
            {
                switch (model.ActiveView)
                {
                    case DataFileAnalyzerModel.FocusedView.FileView: return model.SelectedFile != null && File.Exists(UAF.PathUtils.MakeAbsolute(model.SelectedFile.FilePath, UAF.ProjectManager.Instance.CurrentProject.DataPath));
                    case DataFileAnalyzerModel.FocusedView.ReferencedByMeView: return model.SelectedFile != null && model.SelectedFile.Children.Any(file => file.IsSelected && File.Exists(UAF.PathUtils.MakeAbsolute(file.Path, UAF.ProjectManager.Instance.CurrentProject.DataPath)));
                    case DataFileAnalyzerModel.FocusedView.ReferencingMeView: return model.SelectedFile != null && model.SelectedFile.Parents.Any(file => file.IsSelected && File.Exists(UAF.PathUtils.MakeAbsolute(file.Path, UAF.ProjectManager.Instance.CurrentProject.DataPath)));
                }
            }

            return false;
        }

        public override void Execute(object parameter)
        {
            DataFileAnalyzerModel model = parameter as DataFileAnalyzerModel;
            if (model != null)
            {
                DataFile fileToOpen = null;
                switch (model.ActiveView)
                {
                    case DataFileAnalyzerModel.FocusedView.FileView: fileToOpen = model.SelectedFile; break;
                    case DataFileAnalyzerModel.FocusedView.ReferencedByMeView:
                        {
                            if (model.SelectedFile != null)
                            {
                                DataFileDependency dependency = model.SelectedFile.Children.FirstOrDefault(file => file.IsSelected);
                                fileToOpen = model.Library.GetFile(dependency.Key);
                            }
                        }
                        break;

                    case DataFileAnalyzerModel.FocusedView.ReferencingMeView: 
                        {
                            if (model.SelectedFile != null)
                            {
                                DataFileDependency dependency = model.SelectedFile.Parents.FirstOrDefault(file => file.IsSelected);
                                fileToOpen = model.Library.GetFile(dependency.Key);
                            }
                        }
                        break;
                }

                if (fileToOpen != null)
                {
                    string fileToOpenPath = UAF.PathUtils.MakeAbsolute(fileToOpen.FilePath, UAF.ProjectManager.Instance.CurrentProject.DataPath);
                    if(File.Exists(fileToOpenPath))
                        System.Diagnostics.Process.Start(fileToOpenPath);
                }
            }
        }
    }
}